Clickzone and Scrollview require specific tagging. You need to call the xtclicks.js file before calling the xtcore.js file, and fill the xtidmod and xtergo fields on pages where you wish to track clicks. Models need to be declared beforehand.
If you want to obtain a heatmap via ClickZone, you need to fill the xtcz (zones, equivalent to click chapters) and xtclib (click label) attributes.
You will find additional information in the documentation: http://help.atinternet-solutions.com/EN/implementation/specific_tags/tg_clickzone_en.htm
The activation of ClickZone analyses is free, however the additional hits will increase your server calls, which may put you in a higher billing bracket.
These analyses are only available with xtcore.js.